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22 REPTILIA. same subdivision, have blackish stripes on the sides of the back, a fact worth remembering to avoid an undue multiplication of species.(l) We may separate from the Ameivas certain species, all t~e sc~les of whose belly, legs, and tail, are carinated,(2) and others m wh1ch even those on the back are similarly relieved, so that the flanks only are granulated.(3) A collar under the neck also approximates these species to the lizards.( 4) The LAcERTA, properly so called, Or true Lizards, form the second genus of the Lacertians. The ex­tremity of their palate is armed with two rows of teeth, and they are otherwise distinguished ft·om the Ameivas and Sauvegardes by a collar under tl1e neck, formed of a transverse row of large scales, separated from those on the belly by a space covered with small ones only, like those under the throat; and by the circumstance that a part of the cranium projects over their temples and orbits, so as to furnish the whole top of the head with a bony buckler. (1) Such, it appears to me, is the Teyus ocellifer, Spix, xxv. Add the .11m. litterata, Daud. Seb., I, lxxxiii;-.llm. creruleocephala, Id. Seb. I, xci, 3;-.llm. lateristriga, Cuv. Seb. I, xc, 7;-.llm.lemniscata (Lacert. lemnis, Gm.), Seb. I, xcii, 4;-Teius t1·itamiatus, Spix, xxi, 2;-T. cyanomelas, Pr. Max. Liv. v. (Add .11m. sex-lineata, Catesb. 68. .11m. Ed.] It is impossible to say from what confusion of synonymes Daud. has placed the .11m. litterata in Germany; like all the others, it is from America.. The .11m. gra· phique, Daud. Seb. I, lxxxv, 2, 4, is the Dotted Monitor; his .11m. argus, Seb. I, lxxxv, 3, is the Mon. cepedien; his goitreux, Seb. II, ciii, 3, 4, does not differ from the littcrata; finally, his tete rouge, Seb. I, xci, 1, 2, is a common Green Lizard. He was probably led into error by the coloured plates of Seba. The Lac. 5-li­neata appears to me to be a L. creruleocepltala, a part of whose broken tail had grown :1gain with small scales, as is always the case when that accident happens; the axis of this new portion of the tail is always, also, a cartilaginous stem with­out vertebra:. It is impossible to characterize species by similar accidental cir­cumstances, as Merrem has done in his Teyus monitor and cyaneus. (2) In one sex of one of these species, there are two small spines on each side of. the anus, which circumstance gave rise to the genus CENTROPYX of Spix, XXII, 2. (3) The Lezard f!trie cf Surinam, Daud., III, p. 347, of which Fitzinger makes his genus PSEuno-AMEIV .1. (4) It appears to me that even the Centropyx has palatine teeth; these two sorts of Lizards, however, have the head of aa Ameiva, no bone on the orbit, &c. N.B. Fitzinger makes a genus (Tnus) of the Lezard teyou, Daud. which should have but four toes to the hind feet; its only foundation, however, is an imperfect description of Azzara, and it does not seem to me sufficiently authentic. SAURIA. 23 They are very numerous. Europe produces several species confounded by Linnreus under the name of Lacerta agilia. The most beautiful is the Grand Lhard vert ocelle,-Lac. ocellata, Daud.; Lacep., I, xx; Daud. III, xxxiii, from the south of France, Spain, and Italy. It is more than a foot long, with lines of black dots, forming rings or eyes and a kind of em broidery; the young according toM. Edwards is the Lezard gentil, Daud., III, xxxi. The Lac. viridia, Daud., III, xxxiv, of which the Lac. bilineata, Id. xxxvi, 1, according to the same gentleman, is a variety;-the Lac. aepium, Id. lb. 2, of which the Lac. are­nicola, Id., xxxviii, 2, is a variety;-and the Lac. agilia, Id., xxxviii, 1, are found in the environs of Paris. The south of France produces the Veloce, Pall., to which must be referred the Voaquien, Daud. xxxvi, 2, and some new species.(!) ALGYRA, Cuv. The tongue, teeth, and femoral pores of the Lizards, but the scales of the back and tail are carinated, those of the belly smooth and im­bricated. The collar is wanting.(2) TAOHYDROMus,(3) Daud. Square and carinated scales on the back, under the belly, and on the tail; no collar nor femoral pores, but on each side of the anus is a small vesicle opening by one of the latter. The tongue still like that of the Lizards, and the body and tail very much elongated. FAMILY III. IGUANIDA.(4) This third great family of Saurians possesses the general form, long tail, and free and unequal toes of the Lacertians; (1) I add, but with hesitation, the Lac. cericea, Laur., 11, 5; argus, Id. 5; ter­rutris, Id., III, 5. The tiliguerta of Daudin is made up of an American Amei­va and the green Lizard of Sardinia, from a bad description by Cetti. The creru­leocephala, the lemniscata, the quinquelineata, are .llmeivas. The sexlineata, Catesb., XLVIII, is a Seps. N.B. With due submission to our author, this appears to be a mistake, the sex-tineata, Catesb., is most certainly an Ameiva. .11m. Ed. (2) Lac. alegyra, Lin. (3) Tct.:tu' and l'p~fA.ov, Quick-runner. (4) lguane, a name according to HernaruUz, Scaliger, &c. originating in St Do- \ c-: l